docs: def _compute_mean(self, C, mag, rrup, hypo_depth, delta_R, delta_S,
                        delta_V, delta_I, vs30):
  
          """
          Compute MMI Intensity Value as per Equation in Table 5 and
          Table 7 pag 198.
          """
          # mean is calculated for all the 4 classes using the same equation.
          # For DowrickRhoades2005SSlab, the coefficients which don't appear in
          # Model 3 equationare assigned to zero
  
          mean = (C['A1'] + (C['A2'] + C['A2R'] * delta_R + C['A2V'] * delta_V) *
                  mag + (C['A3'] + C['A3S'] * delta_S + C['A3V'] * delta_V) *
                  np.log10(np.power((rrup**3 + C['d']**3), 1.0 / 3.0)) +
                  C['A4'] * hypo_depth + C['A5'] * delta_I)
  
          # Get S site class term
          S = self._get_site_class(vs30, mean)
  
          # Add S amplification term to mean value
          mean = mean + S
  
          return mean